Smoke simulation set to outflow, the smoke still interact with the ceiling
It's strange, I do not know if this is the intended design, everytime I change the setting of the flow, I need to re-select the &quot;replay&quot; item to make it valid as shown below,

The issue I came accross resulted from the cache from the previous settings not freed up until I re-select the &quot;replay&quot;, so this is my solution.